Stool was placed in fine mesh sieve and rinsed. Fragments were then soaked in a 2:1 water / bleach solution for 10 mins and allow air dry before handling. I think this is a fragment of a tapeworm and assume the yellowish color is from consuming 4-6 frozen Castor Oil gel caps twice daily for 7 days. This was part of the die off? Fragment is roughly 3/8" wide and about 5/8" long. Note the clear skin / casing at top. I assume they shed and this part curls and seen in other pics as casings.